hydrogen peroxide

noun

: an unstable compound H₂O₂ used especially as an oxidizing and bleaching agent, an antiseptic, and a propellant

Examples of hydrogen peroxide in a Sentence

Recent Examples on the Web

Fabric whitening solutions like bleach or hydrogen peroxide work through a process called oxidization. —Andrew Paul, Popular Science, 3 Sep. 2025

Each tray is filled with a gel that contains a 12.5% concentration of hydrogen peroxide, which Dr. Rajpal says should give faster results. —Jessica Kasparian, SELF, 28 Aug. 2025

Using a clean cloth, soak a corner in hydrogen peroxide. —Mary Catherine McAnnally Scott, Southern Living, 26 Aug. 2025

The National Audubon Society recommends cleaning with hot water or a weak solution of vinegar and water or with hydrogen peroxide and water, rather than dish soap, due to the potential for harmful residue. —Jordan Green, Nashville Tennessean, 21 Aug. 2025

Word History

First Known Use

1872, in the meaning defined above

Rhymes for hydrogen peroxide

• aminoglycoside
• chlordiazepoxide
• dimethylformamide
• oligosaccharide
• paraformaldehyde
• polynucleotide
• ribonucleotide
• abide
• allied
• applied
• aside
• astride

Kids Definition

hydrogen peroxide

noun

: an unstable liquid compound containing hydrogen and oxygen and used especially for bleaching and as an antiseptic

Medical Definition

hydrogen peroxide

noun

: an unstable compound H₂O₂ used especially as an oxidizing and bleaching agent and as an antiseptic